How Has the Fraction of Galaxies with Irregular Morphologies Evolved

question 7

Multiple Choice

How has the fraction of galaxies with irregular morphologies evolved from 4 billion years ago to the present epoch?

• A) About 10 percent of today's galaxies are peculiar, whereas 4 billion years ago more than half the galaxies were peculiar.
• B) The fraction has remained at 50 percent over the last 4 billion to 5 billion years.
• C) At the present epoch there are far more interacting galaxies than when the universe was about 9 billion to 10 billion years old.
• D) The fraction has remained at 10 percent over the last 4 billion to 5 billion years.
• E) There are no peculiar galaxies today, whereas 4 billion years ago they comprised nearly 10 percent of galaxies.

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